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Black Opal
Black Opal

Hematite
Hematite



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Black Opal
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Hematite

Black Opal and Hematite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.
 
Brittle
-
-
5.00-5.30
Uneven, ConchoidalWalter Schumann, Conchoidal
None, may show partings on {0001} and {10 1 1}
6
Fe 2O 3Arthur Thomas , Gemstones (2009)

Black Opal and Hematite Chemical Formula

While comparing Black Opal and Hematite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Black Opal and Hematite chemical formula.

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Black Opal and Hematite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Hematite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal Vs Hematite during the identification of gemstone. Specific gravity of Black Opal is whereas that of Hematite is .